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Ophthalmic lens synthesized from its specification

  • US 6,464,355 B1
  • Filed: 02/25/2000
  • Issued: 10/15/2002
  • Est. Priority Date: 09/02/1997
  • Status: Expired due to Fees
First Claim
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1. A method of making a prescription optical lens, comprising an optical surface zone having a plurality of discontinuities, comprising the steps of:

  • a) defining a macroscopic shape for said surface, b) calculating microscopic normals to said marcoscopic shape, whereby said microscopic normals produce the required prescription, c) calculating the surface heights of said optical surface from said calculated microscopic normals by a process of continuous summation of the slopes that are defined by said microscopic normals to said optical surface, d) checking whether a predetermined condition for having a surface discontinuity is fulfilled, e) repeating the process when said predetermined condition is fulfilled, Wherein the distances between consequent discontinuities are sufficiently large that said optical surface zone can not be considered as a diffractive surface.

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